hmmm, that's not so hot. Thanks for the info.
I'm working with a wav shield by Adafruit (or ladyada) that supposedly handles 16 bit, 22kHz, FAT32 and SDHC. I'm not up and running yet, but they've had this one out for a bit, and it's rev 1.1. I'll try to let you know how it works out. Uno is my platform at this point.
I may be pressed for processor power and working memory space, but I don't know if 8bit and that low a sample rate can give me workable fidelity for my purposes.